Which of the following is true about a significant interaction?
a. It is evidence that the research hypothesis is incorrect.
b. It increases the chance of a Type 2 error.
c. It proves the experimenter's predictions.
d. It only gives support for the research hypothesis if the observed means are also in the expected direction.
Question 2
Amanda conducted a 2 x 2 factorial design in which she manipulated lack of food (high or low) and aggressive stimulation (high or low) in dogs. She then measured barking level. Amanda found that in the high food condition more aggressive stimulation reduced barking, whereas in the low food condition more aggressive stimuli increased barking. An interaction in which such opposite effects occur in different levels of different conditions might be which of the following?
a. A main effect interaction
b. A simple interaction
c. A crossover interaction
d. A normal interaction
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